/Engine/Source/Runtime/Engine/Classes/GameFramework/Actor.h
Tells if an object owned by a component has been registered as a replicated subobject of the component
bool IsActorComponentReplicatedSubObjectRegistered ( const [UActorComponent](API\Runtime\Engine\Components\UActorComponent) * OwnerComponent, const [UObject](API\Runtime\CoreUObject\UObject\UObject) * SubObject ) const